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| Illustration 1 | g01309473 |
The Machine ECM will make decisions that are based on input data information and programming parameters that have been flashed to the ECM memory. After the ECM receives the input information, the ECM determines the correct response and sends an output signal to the appropriate device. The internal input circuits and the internal output circuits of the ECM are connected to the machine wiring harness by two 70 contact connectors (J1 and J2).
Note: The ECM is not serviceable. If the ECM is damaged, the ECM must be replaced. The rate of failure for the ECM is low. If the ECM is suspected of failure, contact your dealership's Technical Communicator for possible consultation with AVSpare before replacing the ECM. Replace the ECM only after all of the other possible causes of a particular problem have been investigated.
ECM Pull Up Voltage
In order to aid in diagnostics of certain types of electrical circuits that are controlled by the ECM, an internal "pull up voltage" is connected to ECM switch and sensor signal input contacts. An above normal voltage is internally connected to the ECM signal input circuit through a resistor.
During normal operation, the switch or sensor signal will hold the circuit low or at a certain signal amplitude, however, circuit conditions such as a loss of power to the component, a disconnection, or an open circuit will allow the circuit to be pulled high by the ECM pull up voltage. This will result in an above normal voltage condition at the ECM contact. As a result, the ECM will activate an FMI 03 (voltage above normal) diagnostic code for the affected circuit.
The types of ECM input circuits that have pull up voltage present are:
- Pulse Width Modulated (PWM) sensor input circuits
- Switch to ground switch input circuits
- Active analog (voltage) input signal circuits
- Passive analog (resistance) input signal circuits
ECM Pull Down Voltage
In order to aid in diagnostics of electrical circuits that are controlled by the ECM, an internal "pull down voltage" is connected to ECM switch to battery type input circuits.
During normal operation, the switch contacts that are allowing the connection to a voltage source will hold the circuit high. When circuit conditions such as a loss of power to the switch supply voltage, a disconnection in the switch circuit or an open circuit will allow the circuit to be pulled low by the ECM pull down voltage. This will result in a below normal voltage condition at the ECM contact. As a result, the ECM will activate an FMI 04 (voltage below normal) diagnostic code for the affected circuit.
Inputs
The machine has several different types of input devices. The ECM receives machine status information from the input devices and determines the correct output action that is needed in order to control machine operations based on memory and software parameters. The machine utilizes the following types of inputs: switch type and sensor type.
Switches provide signals to the switch inputs of the ECM. The possible outputs of a switch are listed: an open signal, a grounded signal and + battery signal.
Sensors provide an electrical signal to the ECM that constantly changes. The sensor input to the ECM can be one of several different types of electrical signals such as: pulse width modulated (PWM) signals, voltage signals and frequency input signals. Each possible input to the Machine ECM is listed in the tables for the 70-pin connectors.
Outputs
The ECM sends electrical signals through the outputs. The outputs can create an action or the outputs can provide information to the ECM. The ECM can send output signals to the system components in one of several different electrical signal types such as: driver outputs, sinking driver outputs, sensor power supply outputs and data link outputs. The possible outputs for the Machine ECM are listed in the tables for the 70-pin connectors.
Input/Output
Communication between the Machine ECM and the other control modules on the machine is conducted over data link circuits. The data link circuits allow the sharing of information with other electronic control modules. The data link circuits are bidirectional. The data link circuit allows the ECM to send information and to receive information.
The ECM supports two types of data link systems.
- Cat Data Link
- SAE J1939 Data Link
The two types of data links are the main structure for communication between all of the control modules on the machine. More than one CAN data link system can be present on a machine. Dedicated CAN data link circuits can be used for communication between specific controls on the machine.
Communication between the Machine ECM and the other control modules on the machine are conducted over the J1939 Data Link circuit that is connected to each control module. The ECMs use the Cat Data Link to send and receive information from the AVSpare Electronic Technician (ET).
A module identifier (MID) is assigned to each ECM on a machine. The MID for the Machine ECM is 039.
Note: All diagnostic codes for the components in the machine control system are activated by the Machine ECM (MID 039).
Note: The following tables list every possible connection for the Machine ECM. Some of the listed circuits may not be applicable to your machine. Other attachments may be installed.
D6N/EH
| Machine ECM Connector J1 (MID 039) Contact Descriptions (1) |
||
|---|---|---|
| No. | Function | Type |
| 1 | Key Switch On | Input |
| 2 | XMSN Output Speed Sensor 1 + | |
| 3 | XMSN Output Speed Sensor 1- | |
| 4 | XMSN Output Speed Sensor 2 + | |
| 5 | XMSN Output Speed Sensor 2 - | |
| 10 | Cat Data Link + | Input/Output |
| 13 | - Battery | System Ground |
| 37 | A/C Thermostat | Sw to +Batt Input |
| 15 | TC Output Speed Sensor + | |
| 16 | TC Output Speed Sensor - | |
| 17 | Engine Speed Sensor + | Frequency + |
| 18 | Engine Speed Sensor - | Frequency - |
| 20 | Cat Data Link - | Input/Output |
| 21 | 5V Power Sensor Return | ECM Ground |
| 22 | A/C Recirc Temp | |
| 23 | - Battery | System Ground |
| 24 | A/C Manual Mode | Switch to Battery |
| 25 | A/C Auto Mode | Switch to Battery |
| 26 | Implement Shutoff (N/O) | STG Input |
| 27 | Implement Shutoff (N/C) | STG Input |
| 28 | Increment Switch (N/O) | |
| 29 | A/C Louver Temp | Passive Analog Input (Resistive) |
| 30 | A/C Evaporation Freeze Probe | |
| 31 | +Battery | System Power |
| 33 | Reverse (N/O) | STG Input |
| 34 | Reverse (N/C) | STG Input |
| 35 | Parking brake Switch (Engaged) | STG Input |
| 38 | + Battery | System Power |
| 39 | + Battery | System Power |
| 40 | Parking brake Switch (Released) | STG Input |
| 41 | Autoshift Switch (N/O) | STG Input |
| 42 | Autoshift Switch (N/C) | STG Input |
| 43 | Auto Kickdown Switch (N/O) | STG Input |
| 44 | +8 V Sensor Supply | Power Supply |
| 45 | 8 V Sensor Return | ECM Ground |
| 47 | +Battery | System Power |
| 48 | XMSN Speed Clutch 1 | |
| 49 | XMSN Speed Clutch 2 | |
| 50 | PWM Driver Return (1-4) | PWM Driver Output |
| 51 | XMSN Speed Clutch 3 | |
| 52 | Brake Valve Solenoid | |
| 54 | PWM Driver Return 11-12 | Solenoid Return |
| 55 | PWM Driver Return 9-10 | Solenoid Return |
| 56 | 10V Sensor Return | System Ground |
| 57 | - Battery | System Ground |
| 58 | Blade Tilt Right Solenoid | PWM Driver Output |
| 59 | Blade Tilt Left Solenoid | PWM Driver Output |
| 60 | PWM Driver Return 5-8 | Solenoid Return |
| 61 | Blade Raise Solenoid | PWM Driver Output |
| 62 | Blade Lower Solenoid | PWM Driver Output |
| 63 | Auto/Man & Blade Shake (N/O) | STG Input |
| 64 | Auto/Man & Blade Shake (N/C) | STG Input |
| 65 | XMSN Reverse Clutch | |
| 66 | XMSN Forward Clutch | |
| 67 | Left Steering Valve Solenoid | PWM Driver Output |
| 68 | Right Steering Valve Solenoid | PWM Driver Output |
| 69 | +10V Supply | Power Supply |
| 70 | - Battery | System Ground |
| ( 1 ) | Contacts that are not listed are not used. |
| Machine ECM Connector J2 (MID 039) Contact Descriptions (1) |
||
|---|---|---|
| No. | Function | Type |
| 1 | Keyswitch (Crank) | Sw to +Batt Input |
| 2 | A/C Clutch Solenoid | |
| 3 | Parking brake Solenoid | |
| 4 | Load Return 1 | ECM Ground |
| 5 | Secondary Brake Solenoid | |
| 6 | Backup Alarm | |
| 7 | Start Relay | On/Off Output |
| 8 | Load Return 2 | ECM Ground |
| 14 | Alternator R Term | R Term |
| 19 | A/C Condensers Relay | Sinking Output |
| 20 | Water Valve Actuator Signal | |
| 24 | Steering Lever Position Sensor 1 | PWM Input |
| 25 | Steering Lever Position Sensor 2 | PWM Input |
| 26 | Steering Lever Position Sensor 3 | PWM Input |
| 28 | Upshift Switch (N/O) | STG Input |
| 29 | Upshift Switch (N/C) | STG Input |
| 30 | Downshift Switch (N/O) | STG Input |
| 31 | Downshift Switch (N/C) | STG Input |
| 32 | Service Brake Pedal Sensor | PWM Input |
| 33 | FNR Position Sensor | PWM Input |
| 34 | Steering Motor Speed Sensor A | PWM Input |
| 35 | Steering Motor Speed Sensor B | |
| 36 | Forward Switch (N/O) | STG Input |
| 37 | Forward Switch (N/C) | STG Input |
| 38 | AC Manual Mode | STG Input |
| 39 | Decrement Switch (N/O) | STG Input |
| 40 | Blade Angle Sensor | PWM Input |
| 41 | Blade Raise Select Sensor | PWM Input |
| 42 | Blade Tilt Select Sensor | PWM Input |
| 43 | Ripper Joystick Sensor | PWM Input |
| 64 | CAN B Data Link + | Input/Output |
| 65 | CAN B Data Link - | Input/Output |
| 67 | CAN A Data Link + | Input/Output |
| 68 | CAN A Data Link - | Input/Output |
| ( 1 ) | Contacts that are not listed are not used. |
Implement ECM
| Electronic Implement Control Connector Contact Descriptions (1) |
||
|---|---|---|
| No. | Function | Type |
| 1 | + Battery | System Power |
| 2 | - Battery | System Ground |
| 3 | Key Switch | Input |
| 7 | Location Code (GND) | STG/STB |
| 8 | Location Code (GND) | STG/STB |
| 9 | Location Code (Open) | STG/STB |
| 14 | + Battery | System Power |
| 15 | - Battery | System Ground |
| 16 | 8V Sensor Return | System Ground |
| 19 | Location Code (GND) | STG/STB |
| 20 | PTO Filter Bypass Switch | |
| 21 | Charge Filter Bypass Switch | |
| 22 | Implement Cal Sensor | |
| 24 | + Battery | System Power |
| 25 | - Battery | System Ground |
| 26 | Implement Shutoff Solenoid | |
| 27 | Implement Shutoff Solenoid Return | |
| 36 | Hydraulic Oil Temp Sender | |
| 37 | XMSN Oil Temp Sensor (Sump) | |
| 38 | Fuel Level Sender | |
| 39 | TCO Temperature Sender | |
| 42 | Blade Angle Left Solenoid | |
| 43 | Blade Angle Left Solenoid Return | |
| 48 | Blade Angle Right Solenoid | |
| 49 | Blade Angle Right Solenoid Return | |
| 50 | Ripper Raise Solenoid | |
| 51 | Ripper Raise Solenoid Return | |
| 57 | Cat Data Link + | Input/Output |
| 58 | Ripper Lower Solenoid | |
| 59 | Ripper Lower Solenoid Return | |
| 64 | CAN A Data Link + | Input/Output |
| 65 | CAN A Data Link - | Input/Output |
| 68 | 8V Sensor Power | System Power |
| 70 | Cat Data Link - | Input/Output |
| ( 1 ) | Contacts that are not listed are not used. |
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| Illustration 2 | g01608833 |
Implement ECM pin orientation | |
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| Illustration 3 | g01608896 |